Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2002 Mitsubishi Lancer LSFACTORY OEM SERVICE PROCEDURE
Power Transistor
CAUTION:
Power transistor test must be performed in less than 10 seconds to prevent coil from burning and power transistor from breaking.
- Disconnect power transistor 6-pin and 3-pin connectors. To test section of power transistor that controls cylinders No. 1 and 4 of ignition coil, connect negative end of 1.5-volt battery to terminal No. 4 of power transistor and positive end to terminal No. 3. See Fig 1.
- Using an analog ohmmeter, check for continuity between power transistor terminals No. 4 and 13 (connect negative ohmmeter probe to terminal No. 13). Continuity should exist. With positive end of 1.5-volt battery disconnected, there should be no continuity. Replace power transistor if it fails test.
- To test section of power transistor that controls cylinders No. 2 and 5 of ignition coil, connect negative end of 1.5-volt battery to terminal No. 4 of power transistor and positive end to terminal No. 2.
- Using an analog ohmmeter, check for continuity between power transistor terminals No. 4 and 12 (connect negative ohmmeter probe to terminal No. 12). Continuity should exist. With positive end of 1.5-volt battery disconnected, there should be no continuity. Replace power transistor if it fails test.
- To test section of power transistor that controls cylinders No. 3 and 6 of ignition coil, connect negative end of 1.5-volt battery to terminal No. 4 of power transistor and positive end to terminal No. 1.
- Using an analog ohmmeter, check for continuity between terminals No. 4 and 11 of power transistor (connect negative ohmmeter probe to terminal No. 11). Continuity should exist. With positive end of 1.5-volt battery disconnected, there should be no continuity. Replace power transistor if it fails test.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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